This much we know: Four teams will be given No. 1 seeds on Selection Sunday.

That has to happen. There’s no way around it. Which teams will wind up on that top seed line remains a complete mystery, though. A crazy week continued to produce stunning results on Wednesday night, when Penn State knocked off No. 4 Michigan, 84-78.

Yes, the same Nittany Lions team that was 0-14 in Big Ten play this year.

Yes, the same Michigan team that was in prime position to compete for the Big Ten title and a possible No. 1 seed in the NCAA Tournament.

Penn State trailed by just three points at halftime, but Michigan pushed its advantage up to 15 points (66-51) on a Jon Horford bucket with 10:40 left. The game should have been over at that point, at least realistically. After all, this is a Wolverines team with Trey Burke, a leading candidate for national player of the year, and three other players averaging at least 11.3 points per game.

But the bottom fell out.

From that point forward, Penn State outscored Michigan, 33-12. Unfortunately for the Wolverines, the NCAA Tournament selection committee is watching. Even if the members had turned off the game when it seemed to be in hand, they’ll see the highlights. And they’ll see that unsightly loss pop up on their resume tomorrow.

Penn State came into this game with an RPI ranking of 200. That’s a TCU-bad loss for Michigan. That inside track the Wolverines had on earning a No. 1 seed? It’s gone.

They still have an opportunity to climb back, though. Michigan State and Indiana still have to visit Ann Arbor, and the Big Ten tournament probably will offer at least a couple opportunities for resume boosts. And the Wolverines still have seven RPI top 50 wins, including road victories at Minnesota and Illinois (places where Indiana lost both of their visits, by the way).